Well it really depends on your driving style and how you like your car to react. Changing the endlinks would provide less compliance and allow the sway bar to do its job more effectively. Of course, getting an adjustable sway(usually 22mm middle setting) would allow you to play around with it to suit your preference. However, do not get a thick sway or adjust one to stiff setting without changing the endlinks as the stock ones are rubber and plastic(and will likely snap).

 

However, do not get a thick sway or adjust one to stiff setting without changing the endlinks as the stock ones are rubber and plastic(and will likely snap).

Are there instances in which the stock endlinks have snapped?

 

Right now I have some perrin endlinks on my car and I've noticed a differance in the way it handles. The rear dosen't boat around as much, You will notice a differance espacally if you have a set of good tires

 

This topic is of interest to me because I am thinking about doing the same thing.

Reasons:
1. Stock endlinks are designed to flex and give passive rear-wheel steering. This makes the car feel less precise in hard cornering. I call it a "floating feeling" in the rear end.

2. The flexible endlinks are a part of the cause of the understeer. They keep the rear swaybar from working as quickly and as linearly as it could. Stiffer endlinks should have a noticable effect in reducing understeer.

3. I'm not sure I want a stiffer bar because that reduces the independence of the suspension. I would like to keep as much travel in my set up as possible. Since the stiffer bars cause the inside suspension to compress more relative to the outside, keeping the stock bar appeals to me.

Anyway, this is what I'm thinking. Anyone with info/insight on this issue feel free to point out if/where my thinking is faulty and give any impressions you have.

 

I have Helix endlinks on an otherwise stock (for the time being) suspension. The difference is VERY noticable. I was amazed, actually. All that rear end vagueness is gone. It feels so planted that it actually makes the floaty front end behave more predictably. The Helix may be a better choice for more hardcore suspension systems, ie. coilovers, because with my stock suspension, the spherical bearings reach the end of their travel sometimes. The link and adapters make contact resulting in a clicking noise. Once I get the Koni inserts and better springs in there I'll take stock and see if I keep them.

Otherwise, don't hesitate. A very big bang-for-the-buck upgrade.